Heating device



B. W. MACY HEATING DEVICE Filed Sept. 21, 1927 43 INVENTOR Mac I!,Ba/vzed' M.

ATTORNEY tank showing Patented Nov. 1928. 3

jjfuNirE "STATES 1,690,986 PATENT LOFFICE.

BARNET WRIGHT MAoY. or JAcKsoNvILLE, FLORIDA, AssIGiroR To THE COMMER-CIAL'CLEABINQCOBPOBATION, or JACKSONVILLE, FLORIDA, A- CORPORATION OFFLORIDA.

' HEATING DEVICE.

7 Application filed September 21, 1927. Serial No. 221,112.

. This invention relates for liquids. c p

An object of the invention is theprovision of an electric heater ofsimple construction 5 which is adapted to be inserted within a storagetankfor liquidsand readily secured in place for maintainingthe water ata predetermined temperatures Another object of the invention isthe provision of a heating unit adapted'to be inserted in a storage tank forliquids for maintaining the liquids at a predetermined temperature andin which the electric resistance is located within an oil bath so thattheheat to aheating device 15, is evenly distributed to the liquid inthe storage tank in an economical manner. v p "A" further object of theinvention is the provision of a heating element formed "of resistancematerial enclosed within a copper tubing which is? hermetically sealedand filled with oil to provide for even distribution of the heat and inwhich a thermostat mounted in the oil bath is adaptedto cut oil thecircuit through the resistance 1 element when the temperature ofthe oilhas reached a predetermined degree. I

This invention will be best understood 7 from aconsideration of thefollowing detailed description, in view of the accompanying drawingsforminga part of the specification; neverthelessitis to be understoodthat the invention is not confined to thedisclosure, being susceptibleofsuch changesand' modifications which shall define no material departurefrom thesalient features of expressed in the appended the invention asclaims.

In the drawings 7 a Figure 1 is a vertical section of the storage myheating unit applied thereto, v V p f 4 D Figure 2 is a vertical sectionof the heat-- ing unit per se taken along the line '2 2 of Fig. 1, and IFigure 3 is a horizontal section taken along the line 33 of Fig. 2.

ings 10 designates the base member upon which is mounted the'bottomll ofa storage 3 '50 tank 12. The storage tank has an inlet pipe 13 connectedwith the lower end and an outlet pipe 14 connected'to the upperend'throughi Referring more particularly to. the draw-.

cross section. The storage tank is embraced by a housing 15 andspaced'therefrom, and an insulating material 16 is packed in the space toprevent the loss of heat from the liquid in the tank.

The bottom 11 of the tank is provided with a threaded passage into whichis thread-- ed an annular base member 18 or a cylinder 19 formed ofcopper.

The lower end of the cylinder is secured to. the basemember 18 3provided opening27 through which the oil may be filled. 'Y'Vhen thecylinder is full the opening 27 is'sealed as shown'at 23 with anymaterial suitable for the purpose;

A post 29 has its lower end secured in'the boss 22 and disposed axiallyof the cylinder 19 and terminates at its upper end adjacent the upperend of the cylinder. An insulating sleeve 30 is mountedon the post and anut 31 is threaded onto the upper end of the post and secures aninsulating bar 32 to the upper end of the sleeve 30 and also aids inretaining the insulating sleeve, the post and 'thebar 32 in operativerelation.

'A resistance wire 33 which is spirally formed is trained around thesleeve 30in a spiral manner and has its upper end, as shown at 34,inserted through perforations in the insulating bar 32 and connected tothe upper end 35 of a resistance wire 36 which is of spiral formationand is trained around the sleeve 30 in spiral formation and inanopposite manner to the spiral 33. The lower end ofthe wire 33 issecured to a binding post 37 which projects through aninsu- 'latingsleeve 38 and is connected at its outer end to a wire 39 ofa source ofcurrent.

A thermostat generally designated by the numeral 40 consists of a strip41 formed of two kindsof metal which are secured together in the usualmanner and consists of two'strips of metal having differentco-efiicients of expansion. The lower end of the strip 41 is secured at4 2 to a binding post 43 which is insulated, as shown at 44, from thebottom 22 of the cylinder 19. The free end of the strip 41 is providedwith a contact adapted to normally engage a contact 46 on a metalbracket 47 which is mounted on the binding post 43 but insulatedtherefrom. The wire 36, as shown at as, is secured to the bracket d7 sothat when the strip 41 maintains the contact 45 in engagement with thecontact- 16 current will flow through the wires 33 and 36 and since thiswire is of resistance material the same will be heated for heating theoil in the cylinder'19. Said cylinder isformed of copper so that heatfrom the oil will readily pass to the liquid 51 in the storage tank 12.

The operation of my device is as follows:

The heating unit which is enclosed by the copper cylinder 19 may beinserted or screwed into an opening 17 of the bottom 11 of the storagetank 12 or the same may be screwed into a threaded opening in anenlarged portion of the pipe through which the water is adapted tocirculate. For heating water or other liquids the e ectric current pathrough the wire 52, through the thermostatic element 41, through thebracket a7 and the wires 36 and 33. Even if the oil reaches apredetermined degree the temperature effects the strip 11 and causes thesame to more contact 45 away from contact 46 thereby breaking thecircuit until the oil sufiiciently cools, when the thermostatic stripagain closes the circuit. The heating units which have been applied forheating the oil 50 in the cylinder 19 is transferred to the liquid 51 inthe storage tank 12.

An important feature of theinvention isthat the thermostat is immersedin a bath of oil and thus prevents pitting and sticking of the pointsand thereby eliminatesarcing so that the life of a thermostat isprolonged. The resistance elements 33 and 36 are made of the properalloy in order to eliminate oxidation, concentration of the heat andcarbonization of the oil which is of a conduction and insulating type.The heating unit may not only be employed in storage tanks or incirculating typeset water heaters but may also he cmploycd for steamtables, coilee urns, *lue pots, candy kettles, etc.

I claim A device of the character described comprising a hermeticallysealed cylinder filled with oil, a sleeve formed of insulating mate rialmounted axially on the cylinder, an electric resistance wire in the formof a spiral coil and composed of two sections arranged on the sleeve,one section being soirally wound around the sleeve in one direction. asecond section being wound spirally around the sleere in an opposite.direction to the winding of the first mentioned section. means forconnecting the free ends of the sections with a source of current, athermostat located in the path of oil, and means for interpolatinsr thethermostat-between the source oi current and the free end of the coil.

BARNETT lVR-IGHT MACY.

